package de.intevation.flys.artifacts.states;

import java.util.List;

import org.apache.log4j.Logger;
import org.w3c.dom.Element;

import de.intevation.artifactdatabase.state.Facet;
import de.intevation.artifacts.Artifact;
import de.intevation.artifacts.CallContext;
import de.intevation.artifacts.common.utils.XMLUtils.ElementCreator;
import de.intevation.flys.artifacts.FLYSArtifact;
import de.intevation.flys.artifacts.WINFOArtifact;
import de.intevation.flys.artifacts.access.HistoricalDischargeAccess;
import de.intevation.flys.artifacts.access.HistoricalDischargeAccess.EvaluationMode;
import de.intevation.flys.artifacts.model.CalculationResult;
import de.intevation.flys.artifacts.model.DataFacet;
import de.intevation.flys.artifacts.model.FacetTypes;
import de.intevation.flys.artifacts.model.HistoricalDischargeDifferenceFacet;
import de.intevation.flys.artifacts.model.HistoricalDischargeFacet;
import de.intevation.flys.artifacts.model.HistoricalWQTimerange;
import de.intevation.flys.artifacts.model.ReportFacet;
import de.intevation.flys.artifacts.model.WQTimerange;


/**
 * State to calculate historical discharge curves.
 * 
 * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
 */
public class HistoricalDischargeComputeState extends DefaultState implements
    FacetTypes {

    private static final Logger logger = Logger
        .getLogger(HistoricalDischargeComputeState.class);

    public static final String DEFAULT_UNIT = "cm";

    @Override
    protected void appendItems(Artifact artifact, ElementCreator creator,
        String name, CallContext context, Element select) {
        // TODO IMPLEMENT ME
    }

    @Override
    public Object computeAdvance(FLYSArtifact artifact, String hash,
        CallContext context, List<Facet> facets, Object old) {
        logger.debug("HistoricalDischargeComputeState.computeAdvance");

        WINFOArtifact winfo = (WINFOArtifact) artifact;

        CalculationResult res = old instanceof CalculationResult ? (CalculationResult) old
            : winfo.getHistoricalDischargeData();

        if (facets == null) {
            return res;
        }

        if (res.getReport().hasProblems()) {
            facets.add(new ReportFacet(ComputeType.ADVANCE, hash, id));
        }

        WQTimerange[] data = (WQTimerange[]) res.getData();
        if (data == null || data.length == 0) {
            logger.warn("Historical Discharge calculation has no results!");
            return res;
        }

        facets
            .add(new DataFacet(CSV, "CSV data", ComputeType.ADVANCE, hash, id));

        facets
            .add(new DataFacet(PDF, "PDF data", ComputeType.ADVANCE, hash, id));

        prepareFacets(facets, data, new HistoricalDischargeAccess(artifact));

        return res;
    }

    protected void prepareFacets(List<Facet> facets, WQTimerange[] wqts,
        HistoricalDischargeAccess access) {
        int i = 0;

        for (WQTimerange wqt : wqts) {
            logger.debug("Prepare facet for: " + wqt.getName());

            EvaluationMode evalMode = access.getEvaluationMode();
            if (evalMode == EvaluationMode.W) {
                facets.add(new HistoricalDischargeFacet(i,
                    HISTORICAL_DISCHARGE_Q, createFacetTitle(wqt)));

                if (wqt instanceof HistoricalWQTimerange) {
                    logger
                        .debug("Create another facet for historical differences.");

                    // TODO CREATE BETTER TITLE FOR FACETS
                    facets.add(new HistoricalDischargeDifferenceFacet(i,
                        HISTORICAL_DISCHARGE_Q_DIFF, "DIFF: " + wqt.getName()));
                }
            }
            else {
                facets.add(new HistoricalDischargeFacet(i,
                    HISTORICAL_DISCHARGE_W, createFacetTitle(wqt)));

                if (wqt instanceof HistoricalWQTimerange) {
                    logger
                        .debug("Create another facet for historical differences.");

                    // TODO CREATE BETTER TITLE FOR FACETS
                    facets.add(new HistoricalDischargeDifferenceFacet(i,
                        HISTORICAL_DISCHARGE_W_DIFF, "DIFF: " + wqt.getName()));
                }
            }

            i++;
        }
    }

    protected String createFacetTitle(WQTimerange wqt) {
        String name = wqt.getName();

        return name != null && name.indexOf("W") >= 0 ? createFacetTitleW(wqt)
            : createFacetTitleQ(wqt);
    }

    protected String createFacetTitleW(WQTimerange wqt) {
        String name = wqt.getName();
        return name + " " + DEFAULT_UNIT;
    }

    protected String createFacetTitleQ(WQTimerange wqt) {
        return wqt.getName();
    }
}
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